Evaluation of the Efficacy of trifloxystrobin+fluopyram (SC, 50%) and pyraclostrobin+boscalid (WG, 34.4%) Fungicides against Botrytis cinerea, Causal Agent of Cucumber Grey Mold Disease under Greenhouse Conditions

To study the efficacy of Trifloxystrobin + fluopyram SC 500 (Luna® Sensation) and pyraclostrobin + boscalid WG 34.4% (Signum®) fungicides in controlling the cucumber gray mold disease, experiments were carried out in a Randomized Complete Block Design (RCBD) with 9 treatments and 4 replications under greenhouse conditions. Foliar application of experimental plots began with the onset of symptoms of disease and continued four times with an interval of 7 days. The results were expressed 7 days after the last spraying as the Disease Incidence Percent (DIP) in flowers and fruits for each plant.  Means were compared using Duncan's Multiple Range Test (P = 5%). The analysis of variance (ANOVA) indicated significant difference between treatments but no interaction between fungicide treatments and locations. Mean comparison of treatments, revealed that Luna® Sensation at 0.4 and 0.5 m/L-1 along with Signum® at 1.25 and 1.5 g/L-1 showed 95, 89.8, 95, and 95 % reduction in the disease incidence on flowers respectively, compared to the water spraying control. In this study Diaconal at 3 ml/L-1 as standard fungicide showed only 44.3% efficacy on flower infections and 52.8% efficacy on fruit infections respectively. This study also revealed that, water spraying increased the disease incidence by 8.5% compared with no spraying control. Based on the results, the dose of 0.4 ml/L-1 of Luna® Sensation and 1.5 g/L-1 of Signum® fungicides are the most effective doses for foliar application at 7 day intervals for controlling the gray mold disease of cucumber under greenhouse condition.